Hydrochloric Acid → Methyl 3-bromo-4-hydroxy-5-(3-morpholino-3-oxopropanoyl)benzoate

Temperatur

0 °C

To a solution of lithium bis(trimethylsilyl)amide (1.41 L, 1406 mmol) at −65° C. under nitrogen was added dropwise methyl 3-acetyl-5-bromo-4-hydroxybenzoate (120 g, 439 mmol) in THF (1.2 L). The solution was allowed to warm to 0° C., and maintained at this temperature for 1 h. The solution was cooled back to −65° C. and morpholine-4-carbonyl chloride (0.055 L, 483 mmol) was added. The mixture was stirred at room temperature for 2 h then cooled to −30° C., DCM (1.5 L) and water (1 L) were added followed by dropwise addition of HCl 6N (500 mL) then HCl 2N (300 mL) until pH 7, the aqueous solution was extracted with DCM (3×). The combined extracts were dried over MgSO4 and evaporated. The crude product was triturated in MTBE to obtain methyl 3-bromo-4-hydroxy-5-(3-morpholino-3-oxopropanoyl)benzoate (153 g, 90%) as a beige solid. Mass Spectrum: m/z [M+H]+=388.

1. temperaturemaintained at this temperature for 1 h
2. temperatureThe solution was cooled back to −65° C.
3. temperaturethen cooled to −30° C.
4. extractionHCl 2N (300 mL) until pH 7, the aqueous solution was extracted with DCM (3×)
5. dry with materialThe combined extracts were dried over MgSO4
6. customevaporated
7. customThe crude product was triturated in MTBE

ORD-Eintrag

ord-ac98ea7eac74444ebae29bd7fb48f7ea

Quelldatensatz

uspto-grants-2013_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08530470B2